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Comment converted to answer If you don't have cooling, why are you using the Y terminal? If you have only heat, you can use Red for R, Green for G White for W, and Blue forC`. Also, you'll want to check the rating on the transformer (in volt-amperes) in the furnace and the thermostat (in milliamperes).


2 years later... ecobee thermostats do this nowadays. A Nest and Honeywell's Lyric probably do, also. If you already have one of these systems, a probe can be run to monitor something critical, hooking to an auxiliary port on the thermostat. It will alert you to changes from a scale you've predetermined. The OP didn't seem all that hot to trot spending $100 ...

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